The gunfire erupted shortly after. "All of a sudden you hear gunshots and you just see everybody running towards the door and people falling and screaming," Alexis told the BBC.
Her brother Phil pushed her to the ground, she said, before the two became separated in the chaos.
She was able to escape the venue and took cover outside before someone came to help her up. Alexis said she hid behind another building in case the attacker was still on the loose.